I've ben in the automotive industry for several years before, if I may, switching gears, and out-of-round wheels weren't uncommon on OEM wheels also.
Those wheels are manufactured by aftermarket suppliers, to molds owned by the car manufacturer (ex: the Style 214 are built by Ronal, several BMW wheels were built in the past by BBS).
The manufacturer needs to pay the least they can, and still provide acceptable durability to the wheels, but they don't manufacture them themselves.
Usually, OEM wheels are casted (poured thru a mold) instead of being forged.
2 types of casted wheels:
- Gravity molded (poured in the mold)
- Low pressured casted (removes more imprefection, let's put it that way).
Most of the OEM wheels on the automotive market today are gravity casted, which is the cheapest way of making a wheel, it's like making a cake, for lack of better explanation.
Forged wheel uses a solid aluminium block, which is then machined to specification. You have 1 piece forged, 2 pieces (center and rim made separately, then attached together), 3pieces, ...
When you buy an aftermarket wheel, it's recommended by the retailer to check them BEFORE mounting them, because it's possible to have an out-of-round on the massive amount of wheels they purchase.
That's what the automotive manufacturer does, so that's why we see less out-of-round wheels from them, they act as a good customer
.